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United States Patent | 6,240,064 |
Ouchi | May 29, 2001 |
1:N duplex communication equipment which has a host device and slave devices interconnected in a ring form is disclosed. In the equipment, the path distributing part 3 of the host device transmits an identical path to the two-way transmission line of the ring, and a path selecting part 4 selects a normal one of paths from the two-way transmission lines. The path distributing part 6 of each slave device distributes a path from one transmission line to the other transmission line and the path selecting part. A path selecting part 5 selects paths sent from the host device through the two-way transmission lines from the path distributing part. A path selecting part 8 selects a path sent from another slave device through the two-way transmission lines and outputs this path to a transmitted data control part 9. The transmitted data control part 9 selects data to be transmitted to the host device from received data in the selected path and transmitted data of its own device. A path transmitting part 10 transmits data from the transmitted data control part through the paths of the two-way transmission lines. Thus, 1:N bi-directional communication is performed by a smaller number of paths.
Inventors: | Ouchi; Haruko (Tokyo, JP) |
Assignee: | NEC Corporation (Tokyo, JP) |
Appl. No.: | 845036 |
Filed: | April 21, 1997 |
Apr 19, 1996[JP] | 8-098513 |
Current U.S. Class: | 370/223 |
Intern'l Class: | G01R 031/08 |
Field of Search: | 370/223,224,364,365,450,452,454,424,434,276 340/827 |
4615029 | Sep., 1986 | Hu et al. | 370/89. |
5150356 | Sep., 1992 | Tsutsui | 370/223. |
5166675 | Nov., 1992 | Amemiya et al. | 340/825. |
5191579 | Mar., 1993 | Matsushita et al. | 370/85. |
5278824 | Jan., 1994 | Kremer | 370/223. |
5282200 | Jan., 1994 | Dempsey et al. | 370/245. |
5581710 | Dec., 1996 | Noel, Jr. et al. | 395/200. |
5657446 | Aug., 1997 | Pinard et al. | 379/90. |
5745476 | Apr., 1998 | Chaudhuri | 370/222. |
5793754 | Aug., 1998 | Houldsworth et al. | 370/276. |
5799001 | Aug., 1998 | Lee et al. | 370/220. |
5815490 | Sep., 1998 | Lu | 370/223. |
5901137 | May., 1999 | Nakabayashi | 370/222. |
5982747 | Nov., 1999 | Ramfelt et al. | 370/224. |